Marking gauge



R. CALDWELL MARKING GAUGE 2 Sheets-Sheet l Filed July 6, 1945 INVENTOR, fray muon/EM- BY z A A l NOV. 28, 1950 R, CALDWELL 2,531,803

MARKING GAUGE Filed July 6, 1945 4 2 Sheets-Sheet 2 Wvg/vm; Hor au o WEL L,

M Arrows-m Patented Nov. 28, `1950 UNITED STATES PATENT OFFICE MARKING GAUGE Roy Caldwell, Cleariield, Pa.

Application July 6, 1945, Serial N o. 603,446

2 Claims.

This invention relates to a marking gauge.

An object of the invention is the construction of :a novel and eiiicient device for marking on objects.

Another object of the invention is the construction of a novel marking gauge whereby accurate adjustments can be obtained, for eflicient results.

A still further object is the construction-of a novel marking gauge in which a pair of internally threaded plates is employed, whereby a very minute or accurate adjustment can be obtained. during the operation` of the device.

With the foregoing and other objects in View, my invention comprises certain novel constructions, combinations and arrangements of parts as will be hereinafter fully described, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims.

In the drawings:

Fig-ure 1 is a view partly in elevation and partly in section of a device constructed in accord ance with the present invention.

Figure 2 is a View in end elevation.

Figure 3 is a fragmentary view of the stock, the same being shown in longitudinal section, while the head and its parts are shown in transverse section.

Figure 4 is a fragmentary sectional view of the device, showing the primary clamping plate tight upon the stock, while Figure 5 is a similar View, showing the primary clamping plate in a raised or unclamping position.

Figure 6 is an enlarged fragmentary sectional view of the primary clamping plate and the thumb screw.

Figure '7 is a View in end elevation of another embodiment of the present invention.

Figure 8 is a vertical sectional view taken lon line 8 8, Figure '7.

Figure 9 is a fragmentary view in end elevation, showing the device in :a releasing position.

Figure 10 is a vertical sectional View taken on line Ill-I0, Figure 9.

Figure 11 is a horizontal sectional view of the head.

Figure 12 is a fragmentary vertical sectional View of the head.

Referring to the drawings, in which is shown, in Figures 1 to 6, the preferred embodiment of my invention, l designates the stock of the gauge, which stock may be :a hollow pipe or tube with external threads thereon. A suitable plug 2 is in one end of the stock l, supporting a suitable scribing point 3. u

A head 4 is mounted on the stock l, and this head comprises a, body 5, formed of wood or plastic material. There is a `pair of metal discs l fastened by screw le to the body 5. The body 5 and discs 6 are provided with a large central aperture 5a.

A threaded thumlb screw l is on body 5. This thumb screw 'l is provided on its inner end with a head 8, Fig. 6. A primary clamping plate 9 is in aperture 5a and is retained on the inner end of said thumb screw l by means of said head 8. This primary plate 9 is internally threaded. An auxiliary clamping plate I is placed in the aperture 5a of head 4 andis held in a fixed position at the bottom of aperture 5a by means of screw Il. This auxiliary plate is also internally screw threaded; this constitutes broadly 'threaded means on said head 4.

When the thumb screw l is turned sufciently upon the body d, to place said screw in a closed position, the primary plate S will be tightly clamping the stock l, whereby the stock is held in an adjusted fixed position. If the operator desires to make a considerable adjustment, by loosening primary plate 9, through the medium of the thumb screw l, the primary plate 9 can be raised, as clearly shown in Figure 5, whereupon the stock l can be quickly slid or adjusted upon the head li. When an approximate desired condition is obtained, the primary plate 9 can be approximately placed in a clamping position, but not altogether binding the parts together; by slightly turning the stock l, a small and accurate adjustment. can be obtained, then the operator can cause the primary plate 9- to tightly clamp the stock, whereupon the device will be in the desired condition for operation. Therefore, it will be understood that stock l screws upon the threads of plates 9 and IB, when only a small or slight adjustment is desired. It will also be seen that this braking action prevents sudden or too radical adjustment, which is a great advantage in obtaining accurate adjustments.

Referring to the embodiment illustrated in Figures 7 to l2, the head t is provided with threaded means 4a, which is engaged by the stock I. The screw 'l is provided on its inner end with a clamping plate 9a; this plate does not have any' threads thereon, as it is smooth on the stock-engaging face thereof. When an adjustment is desired,

the thumb screw 1 is turned so as to place the clamping plate 9a in the position shown in Fig. l0, whereupon the head 4 and stock l can be adjusted with respect to each other. If desired, thumb screw l may be only slightly rotated, for

relieving pressure through clamping plate 98 upon stock I, whereby a very small, accurate adjustment can be obtained.

When clamping plate 92L is tightly against stock I, the threads of said stock will be seated in the threads 4a of the head 4, securely fastening the parts in their adjusted position.

While I have described the preferred embodiments of my invention and illustrated the same in the accompanying drawings, certain minor changes or alterations may appear to one skilled in the art to which this invention relates during the extensive manufacture of the same, and I, therefore, reserve the right to make such changes or alterations as shall fairly fall vwithin the scope of the appended claims.

What I claim is:

1. In a marking gauge, a threaded stock, having a scribing point projecting laterally from one end, a head on said stock having a vertically elongated opening therein, an arcuate plate fitted in the lower end of said opening, a screw passing through said plate and engaging in said head to hold said plate in position, said head having a threaded opening extending through the upper end of said head into said opening, a thumb screw extending through said opening, and a second arcuate plate in said opening and having threads on the side confronting the first plate, and a swivel connection between the second plate and the thumb screw for causing movement of the second plate towards and from the first plate by revolution of said thumb screw.

2. In a marking gauge, a threaded stock, having a scribing point projecting laterally from one end, a head on said stock having a vertically elongated opening therein, an arcuate plate fitted in the lower end of said opening, a screw passing through said plate and engaging in said head to hold said plate in position, said head having a threaded opening extending through the upper end of said head into said opening, a thumb screw extending through said opening, and a second arcuate plate in said opening and having threads on the side confronting the iirst plate, a swivel connection between the second plate and the thumb screw for causing movement of the second plate towards and from the rst plate by revolution of said thumb screw, and wear plates on the sides of said head.

ROY CALDWELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 169,027 Naumann Oct. 19, 1875 294,781 Hilts Mar. 11, 1884 390,789 Little Oct. 9, 1888 438,738 Tansley Oct. 21, 1890 1,039,055 Helwig June 29, 1915 1,144,569 Sylvester June 29, 1915 FOREIGN PATENTS Number Country Date 14,920 Y Great Britain 1901 65,190 Sweden Dec. 6, 1926 

